Vintage Faux Pearl Clip on Earrings Marked Japan

This is a antique pair of fake pearl earrings which are functional and still beautiful. As you can see in the photos, the backs of the earrings have some discoloration due to age but this area is not seen during wear. These earrings have a functional Clasp that closes tight to the ear. I do not know the age of these earrings but I do know they are marked Japan and appear to be antique. Box 1 #77